mineral

Ferruginous Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Hardness: 7 (Mohs scale); Color: Rusty orange, reddish-brown, yellow; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture.

Hardness: 7 (Mohs scale)
Color: Rusty orange, reddish-brown, yellow
Luster: Vitreous to waxy

Identified May 7, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Rusty orange, reddish-brown, yellow; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture.

Formation & geological history

Formed in hydrothermal veins or pegmatites where silica-rich fluids mix with iron oxides like hematite or limonite. Most specimens date from various geological eras depending on location, often found in metamorphic or sedimentary environments.

Uses & applications

Used primarily in lapidary arts for decorative carvings (like the heart shown), jewelry, and as a collector's specimen. It is also significant in metaphysical practices as 'Hematoid Quartz'.

Geological facts

The orange and red colors are not inherent to the quartz itself but are caused by internal staining or inclusions of iron minerals. It is often referred to as 'Golden Healer' or 'Fire Quartz' in the gemstone trade.

Field identification & locations

Identify by its hardness (will scratch glass) and the presence of internal rusty-colored phantom layers or streaks. Commonly found in Madagascar, Brazil, and Spain.

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